Compared to H13, H11 contains slightly lower vanadium and carbon content, which gives it:

• Higher toughness
• Better crack resistance
• Improved resistance to thermal shock

This makes H11 particularly valuable for tooling that experiences severe cyclic stresses or intermittent water cooling.

For readers comparing high speed tool steel grades, our article on High-Speed Steel: Precision and Performance by Toolman offers a broader perspective on how tool steels are selected for demanding industrial environments.

Chemical Composition of H11 Tool Steel

The chemistry of H11 is carefully balanced to combine hardness, toughness and thermal stability.

H11 / DIN 1.2343 Typical Composition (% by weight)

Element	Min (%)	Max (%)
C	0.33	0.43
Si	0.80	1.25
Mn	0.20	0.60
Cr	4.75	5.50
Mo	1.10	1.60
V	0.30	0.60
Ni + Cu	–	≤0.75
S	–	≤0.03
P	–	≤0.03

Values shown are typical reference values and may vary slightly depending on processing conditions.

The chromium improves heat resistance and hardenability, molybdenum enhances hot strength, while vanadium contributes to wear resistance and microstructural stability.

Mechanical, Physical & Thermal Properties

H11 is valued because it maintains its integrity under repeated thermal cycling while still offering good toughness.

Mechanical Properties

ITEMS	Value
Annealed Hardness	Max. 235 HBW
Hardness After Quenching	Min. 53 HRC
Tensile strength	1792 MPa
Yield Strength (MPa)	1,200 - 1,550
Yield Strength	1482 MPa
Elongation	8%
Impact Toughness	13.6-33.9 J/cm2

Physical Properties

Property	Value
Density (g/cm³)	7.8 g/cm³
Modulus of Elasticity (GPa)	215

Modulus of Elasticity

Condition	Value
At 500°C	190-210 GPa
At 600°C	165 GPa

Thermal Properties

Temperature (℃)	Thermal Expansion Coefficient (10^-6/℃)
500	12.9
600	13

Thermal Conductivity

Temperature (℃)	W/m•K
500	28.3
600	29.3

Why H11 Performs So Well in Hot Work Applications

The real advantage of H11 is not extreme hardness – it’s controlled toughness under heat.

In hot work environments, tooling faces:

• Rapid heating and cooling cycles
• Mechanical shock loads
• Surface fatigue
• Heat checking

H11’s relatively lower carbon content gives it greater crack resistance than H13, especially in larger tooling sections or tools exposed to water cooling. 

This is why H11 is widely chosen for:

• Large die blocks
• Forging dies
• Extrusion tooling
• Hot punches
• Die holders
• Tool holders and shrink-fit tooling

Common Applications of H11 Steel

Typical Applications

• Forging dies and hammer tools
• Extrusion dies and mandrels
• Hot shear blades
• Die casting dies
• Hot punches and holders
• Ejector pins and die holders
• Tool holders and shrink-fit chucks

It is particularly effective in tooling environments where thermal shock resistance matters more than extreme wear resistance. 

Heat Treatment & Processing

Like most hot work steels, H11 achieves its performance through controlled heat treatment.

Heat Treatment & Processing Parameters

Process	Temperature °C	Duration	Cooling Method
Soft annealing	800 - 860 °C	2 - 5 h	Furnace
Stress-relief annealing	600 - 650 °C	Min. 4 h	Furnace
Hardening	1020 - 1060 °C	Group II	Oil, Air, WB 500 °C
Tempering	530 - 700 °C	Min. 2 h	Still Air

Double tempering is generally recommended for improved dimensional stability and thermal fatigue resistance.

 

Hot Work Steel Comparison

Grade	Best Feature	Typical Use
H11 / DIN 1.2343	Toughness & thermal shock resistance	Forging & extrusion tooling
H13 / DIN 1.2344	Wear resistance & thermal fatigue performance	Die casting & hot work dies
DIN 1.2367	Deep hardenability & high-temperature strength	Heavy-section hot work tools

Toolman Advantage

Choosing the right steel grade is only part of the equation. Consistency of metallurgy and processing matters just as much.

At Toolman Special Steels, we:

• Supply H11 in bars, flats, plates and custom die blocks
• Offer annealed and heat-treated conditions
• Conduct ultrasonic testing and hardness profiling
• Provide export-ready documentation and logistics support

Our manufacturing ecosystem includes:

• Electric Arc Furnaces (EAF)
• Ladle Refining Furnaces (LRF)
• ESR processing for select grades
• Forging presses and rolling mills

Manufacturing Range

Products	Diameter (mm)
Hot Rolled bar	8 - 65
Forged and Turned bars	65.2 - 500
Forged Square Bars	50 - 500

Flats

THICKNESS	WIDTH
6.00 mm - 410.00 mm	20.00 mm - 700.00 mm

Why Global Buyers Choose Toolman

Over the years, one thing has remained consistent: international tooling manufacturers value predictability.

That’s why Toolman continues to supply H11 to customers across:

• USA
• Europe
• Japan
• Turkey
• Southeast Asia

Our long-standing reputation is built on:

• Metallurgical consistency
• Reliable export supply
• Technical support for tooling applications
• Decades of hot work steel expertise since 1957

Need H11 / DIN 1.2343 for Forging, Extrusion, or Hot Punching?

If your tooling application demands thermal shock resistance, toughness and dimensional stability, H11 is a proven hot work steel solution.

Whether you need forged bars, die blocks, plates, flats, annealed supply, or heat-treated stock, Toolman Special Steels can support your project with the right material condition, documentation and technical guidance.

Closing Note

In hot work tooling, failure usually begins with thermal fatigue, cracking, or instability. H11/ DIN 1.2343 continues to remain relevant because it addresses these challenges at their core – combining toughness, heat resistance and reliability in one balanced grade.

At Toolman Special Steels, we continue to manufacture and supply H11 with the consistency global industries expect from a trusted hot work steel partner.

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Looking for a reliable H11 / DIN 1.2343 hot work tool steel supplier?

 Download the H11 / DIN 1.2343 Technical Datasheet
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